The Mainstream Permanent ultrasonic area-velocity flowmeter has proved itself to be one of the most reliable and efficient open channel flowmeters available on the market today. Reliable, high performance and quick to install, Mainstream flowmeters are used in wide ranging applications. For flow measurement in open channels and part-filled pipes where power is available, with liquids from clean water to raw sewage, the Mainstream flowmeter provides the highest quality performance at the most competitive price.
Optimal performance is maintained by a processor embedded in the submerged probe which adjusts operation according to the prevailing conditions. The probe may be located up to 500 metres from the system unit and measures flow velocities from less than 0.02 m/S up to 5 m/S.
The system unit displays liquid level, flow velocity, flow rate and totalized flow. Analog outputs transmit flow information and opto-isolated switches can activate alarms or operate samplers. An integral data logger stores measured and calculated information for graphing or analysis.
Easy to use PC software simplifies commissioning and product support. Features include a point-and-click graphical interface to specify predefined or non-standard pipe and channel cross-sections and remote flowmeter diagnostics via email.
Specifications.
Rugged aluminium housing for permanent installation.
Stainless steel pressure transmitter
Sensor interface fully compatible with alternative level sensors providing 4:20 mA signals.
Large character LCD configurable for most engineering units.
LCD legend available in various languages.
RS232 compatible local serial port.
Automatic error detection protocol.
Windows 98, Me, 2000 and XP compatible
Mainstream Communicator software included with each flowmeter.
Integral data logger with recording rate configurable for 30 seconds to 60 minute intervals.
Facility to organise logged data into daily records with user selectable start time.
Logger capacity approximately 250,000 measurements corresponding to more than 6 months data at 2 minute intervals.
Logger incorporates data compression for rapid data retrieval using Mainstream Communicator software.
Recorded measurements output in spreadsheet compatible format.
Two opto-isolated switch outputs available
Switches independently programmable to open or close at a user defined level, ultrasound signal quality, velocity or flow rate. Switches also configurable to generate pulses to indicate a user defined flow quantity.
Four opto-isolated 4:20 mA outputs transmitting level, ultrasound signal quality, velocity and flow rate information with user defined scaling.
Outputs may be operated in active mode using integral isolated 24V dc supply or in passive mode powered by external measurement loop.
Nominal 24V dc (18 to 30V) at 200 mA maximum current (optional 4:20 mA outputs operating in active mode).
Auxiliary 12V dc input for low power (battery) applications and uninterruptable operation. Low power operating modes down to 2 Ah per month.
Bi-directional velocity measurement with better than 100:1 turndown ratio.
Velocity measurement range from 10 mm/S to 5 m/S. Resolution 1 mm/S.
Guaranteed no zero offset or drift.
Level measurement conversion accuracy better than 0.05% of full scale.
Flow measurement accuracy depends on installation and operating conditions. Typically better than 2% in evaluation trials
